00:01
Okay, in this problem we have that in testing the hypothesis h, our null hypothesis is where mu is equal to 75, and then our alternate hypothesis is that our mu is less than 75, which means we have a left -tailed test.
00:15
If the value of the test statistic z is equal to negative point, or sorry, negative 2 .42, then what is the p -value? so essentially what that is saying, right, is let's look at a graph of our normal distribution, right? we're saying, yikes, that was pretty bad.
00:34
All right, let's try that again.
00:35
Here's our average, dot dot dot dot dot dot dot, here's one standard deviation, two standard deviations.
00:41
We're saying our z -score is negative 2 .42.
00:44
That means that it's 2 .42 standard deviations to the left of the mean...